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G. B. WILLIAMSON. PROCESS FOR CONTINUOUS DEFECATION 0F SUGAR SOLUTIONS.

APPLICATION FILED APR. 39. ISHB. LSNEOTL PatentedSept. 30,1919.

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INVENTOR E b 6T6. M/amso/z A TTOR/VEVS within the defecating tank. The solution is maintained within the tank at a level slightly above the partitions 4. The steam in the pipe raises the temperature of the solution within the tank to about 210 1*. The heat facilitates the reaction between the defecants and the solutions causing the precipitation of albuminoids and organic acids.

The precipitant carries a iy with it suspended impurities which with the air are carried to the 'sliir face andv form a layer. of scum at the top, leaving a ciear solution at the bottom. Inthis operation a clear solution may be obtained rapidly by using from to 50 pounds steam, which will give a thorough separation in about-ten minutes. Having obtained the clear solution the steam is lowered to ten pounds pressure; and the inlet 6 and outlet '7 from the tank 1-3 may be opened to cause a continuous How of the solution,-wla.ich may be regulated to maintain the same temperature in the tank.

The bafiie plates serve as a guide for the impurities, to direct them toward the top where they are entangled with the albuminoids and discharged through a special overflow 8 provided in the tank.

In cases "where sugar that has deteriorated is being Worked, .the'waslnng cannot be run continuously, owingto fermentation which is active upon heating and breaks up the precipitate and allows the air to escape before settling. In such cases the solution is treated in the manner described and heated by running continuously through the deifiecatorand allowed to settle in the tanks, whi'oh takes about thirty minutes. This tiog method of defecation is more economical and gives. perfect results. it can be easily controlled and gives a greater yield of sugar. 'lhe cost of the defecants very low, for a gij'eatamount of air is used with great ad vantage, as has been clearly shown.

I claim: I

1. A; process for defecating sugar solu- Which consists in treating the solutions- With defecants,then aerating the solutions by bubbling air through them, and then heating the solutions to cause the impurities to rise. to the surface.

A process for defecating sugar solutions, which consists in treating a solution. with lime, aerating the solution by"l'u1bbli ng air through it, and then heating the solution to cause the impurities to r.ise:to the surface.

A. process for defecating sugar solutions, which consists in treating a solution with phosphoric acid, neutralizii'ig the solution with lime, aerating the so-trcated solution by bubbling air througl'i. it then heating the solution, the air in the heated solution being caused to rise and entrain therewith the impurities and the compounds formedby the defecants used.

4. A process for defecating su ar solutions, which consists in treating a solution ivithan acid, neutralizing the so-treated solution with lime, draining it off, aerating the so-drained solution, heating the aerated solution to cause the impurities to rise to the surface, and draining off the clear liquid from the bottom.

enonen e. WILLIAMSON. 

